poetry lock the experimental package. (#9478)

libs/experimental/langchain_experimental/cpal/base.py

@@ -6,7 +6,6 @@ from __future__ import annotations
 import json
 from typing import Any, ClassVar, Dict, List, Optional, Type
 
-import pydantic
 from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
@@ -14,6 +13,7 @@ from langchain.chains.llm import LLMChain
 from langchain.output_parsers import PydanticOutputParser
 from langchain.prompts.prompt import PromptTemplate
 
+from langchain_experimental import pydantic_v1 as pydantic
 from langchain_experimental.cpal.constants import Constant
 from langchain_experimental.cpal.models import (
     CausalModel,

libs/experimental/langchain_experimental/pydantic_v1/__init__.py

@@ -1,3 +1,4 @@
+import typing
 from importlib import metadata
 
 ## Create namespaces for pydantic v1 and v2.
@@ -11,11 +12,19 @@ from importlib import metadata
 #   unambiguously uses either v1 or v2 API.
 # * This change is easier to roll out and roll back.
 
-try:
-    from pydantic.v1 import *  # noqa: F403
-except ImportError:
+# It's currently impossible to support mypy for both pydantic v1 and v2 at once:
+# https://github.com/pydantic/pydantic/issues/6022
+#
+# In the lint environment, pydantic is currently v1.
+# When we upgrade it to pydantic v2, we'll need
+# to replace this with `from pydantic.v1 import *`.
+if typing.TYPE_CHECKING:
     from pydantic import *  # noqa: F403
-
+else:
+    try:
+        from pydantic.v1 import *  # noqa: F403
+    except ImportError:
+        from pydantic import *  # noqa: F403
 
 try:
     _PYDANTIC_MAJOR_VERSION: int = int(metadata.version("pydantic").split(".")[0])

libs/experimental/langchain_experimental/pydantic_v1/dataclasses.py

@@ -1,4 +1,15 @@
-try:
-    from pydantic.v1.dataclasses import *  # noqa: F403
-except ImportError:
+import typing
+
+# It's currently impossible to support mypy for both pydantic v1 and v2 at once:
+# https://github.com/pydantic/pydantic/issues/6022
+#
+# In the lint environment, pydantic is currently v1.
+# When we upgrade it to pydantic v2, we'll need to
+# replace this with `from pydantic.v1.dataclasses import *`.
+if typing.TYPE_CHECKING:
     from pydantic.dataclasses import *  # noqa: F403
+else:
+    try:
+        from pydantic.v1.dataclasses import *  # noqa: F403
+    except ImportError:
+        from pydantic.dataclasses import *  # noqa: F403

libs/experimental/langchain_experimental/pydantic_v1/main.py

@@ -1,4 +1,15 @@
-try:
-    from pydantic.v1.main import *  # noqa: F403
-except ImportError:
+import typing
+
+# It's currently impossible to support mypy for both pydantic v1 and v2 at once:
+# https://github.com/pydantic/pydantic/issues/6022
+#
+# In the lint environment, pydantic is currently v1.
+# When we upgrade it to pydantic v2, we'll need
+# to replace this with `from pydantic.v1.main import *`.
+if typing.TYPE_CHECKING:
     from pydantic.main import *  # noqa: F403
+else:
+    try:
+        from pydantic.v1.main import *  # noqa: F403
+    except ImportError:
+        from pydantic.main import *  # noqa: F403

libs/experimental/tests/integration_tests/chains/test_cpal.py

@@ -5,12 +5,12 @@ import unittest
 from typing import Type
 from unittest import mock
 
-import pydantic
 import pytest
 from langchain import OpenAI
 from langchain.output_parsers import PydanticOutputParser
 from langchain.prompts.prompt import PromptTemplate
 
+from langchain_experimental import pydantic_v1 as pydantic
 from langchain_experimental.cpal.base import (
     CausalChain,
     CPALChain,